6533b823fe1ef96bd127f5b6

RESEARCH PRODUCT

Experimental Investigation into the Effect of Pyrolysis on Chemical Forms of Heavy Metals in Sewage Sludge Biochar (SSB), with Brief Ecological Risk Assessment

Yu RenHaihong FanSongxiong DingBinbin Li

subject

020209 energyecological risk assessment02 engineering and technology010501 environmental scienceslcsh:Technology01 natural sciencesArticleMetalSpecific surface areaBiochar0202 electrical engineering electronic engineering information engineeringGeneral Materials Sciencelcsh:Microscopyheavy metalslcsh:QC120-168.850105 earth and related environmental scienceslcsh:QH201-278.5sewage sludgelcsh:TCarbonizationChemistryBCR sequential extractionHeavy metalspyrolysisBioavailabilityVDP::Teknologi: 500lcsh:TA1-2040visual_artEnvironmental chemistryvisual_art.visual_art_mediumlcsh:Descriptive and experimental mechanicslcsh:Electrical engineering. Electronics. Nuclear engineeringlcsh:Engineering (General). Civil engineering (General)lcsh:TK1-9971PyrolysisSludge

description

Experimental investigations were carried out to study the effect of pyrolysis temperature on the characteristics, structure and total heavy metal contents of sewage sludge biochar (SSB). The changes in chemical forms of the heavy metals (Zn, Cu, Cr, Ni, Pb and Cd) caused by pyrolysis were analyzed, and the potential ecological risk of heavy metals in biochar (SSB) was evaluated. The conversion of sewage sludge into biochar by pyrolysis reduced the H/C and O/C ratios considerably, resulting in stronger carbonization and a higher degree of aromatic condensation in biochar. Measurement results showed that the pH and specific surface area of biochar increased as the pyrolysis temperature increased. It was found that elements Zn, Cu, Cr and Ni were enriched and confined in biochar SSB with increasing pyrolysis temperature from 300&ndash

yearjournalcountryeditionlanguage
2021-01-18Materials
https://doi.org/10.3390/ma14020447